WO2014184951A1 - 回転電機の固定子 - Google Patents

回転電機の固定子 Download PDF

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Publication number
WO2014184951A1
WO2014184951A1 PCT/JP2013/063795 JP2013063795W WO2014184951A1 WO 2014184951 A1 WO2014184951 A1 WO 2014184951A1 JP 2013063795 W JP2013063795 W JP 2013063795W WO 2014184951 A1 WO2014184951 A1 WO 2014184951A1
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WO
WIPO (PCT)
Prior art keywords
stator
winding
turtle shell
slot
windings
Prior art date
Application number
PCT/JP2013/063795
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English (en)
French (fr)
Japanese (ja)
Inventor
拓郎 磯谷
吉野　裕
雄亮 尾本
長谷川　裕之
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201380076646.1A priority Critical patent/CN105229900A/zh
Priority to PCT/JP2013/063795 priority patent/WO2014184951A1/ja
Priority to JP2015516859A priority patent/JP5855318B2/ja
Publication of WO2014184951A1 publication Critical patent/WO2014184951A1/ja

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/18—Windings for salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/0056—Manufacturing winding connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/0006—Disassembling, repairing or modifying dynamo-electric machines

Definitions

  • the present invention relates to a stator of a rotating electric machine.
  • Patent Document 1 the multiplex winding turtle shell winding of each phase is divided into a plurality of sets made of an equal number of strands, and the insertion position from the back side of the slot is sequentially changed for each set, so that each set It is described that the upper and lower positions of the connecting wire of the multi-turn turtle shell winding are exchanged.
  • dislocation is applied to the connection line between the multi-turn turtle shell windings, it is said that eddy current loss and circulating current are reduced in the multi-turn turtle shell winding.
  • connection lines crossover lines
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a stator of a rotating electrical machine that can reduce the burden of preparation for performing a transition of a jumper.
  • a stator of a rotating electric machine is inserted into a plurality of slots and wound around a stator core having a plurality of slots.
  • the stator winding is re-patterned in a pattern different from that before cutting because the crossover wires are partially cut after the plurality of windings are inserted into the plurality of slots. It is characterized in that the connecting wire is dislocated by being connected.
  • the stator winding is moved by partially connecting the connecting wires after the plurality of windings are inserted into the plurality of slots and reconnecting the connecting wires in a pattern different from that before the cutting.
  • Line dislocation is performed and configured.
  • FIG. 1 is a diagram illustrating a configuration of a stator of a rotating electrical machine according to an embodiment.
  • FIG. 2 is a diagram showing the number of strands of the multi-turn turtle shell winding inserted per slot according to the embodiment.
  • FIG. 3 is a schematic view of a multi-turn turtle shell winding of a 48-slot four-pole machine manufactured according to the embodiment.
  • FIG. 4 is a diagram for explaining cutting and reconnection of a multi-turn turtle shell winding of a 48-slot 4-pole machine manufactured according to the embodiment.
  • FIG. 5 is a schematic view showing a state in which a multi-turn turtle shell winding of a 48-slot 4-pole machine manufactured according to the embodiment is inserted into a stator core.
  • FIG. 1 is a diagram illustrating a configuration of a stator of a rotating electrical machine according to an embodiment.
  • FIG. 2 is a diagram showing the number of strands of the multi-turn turtle shell winding inserted per slot according to the embodiment
  • FIG. 6 is an equivalent circuit diagram of a 48-slot 4-pole machine manufactured according to the embodiment.
  • FIG. 7 is a diagram illustrating a connection state at the time of slot insertion, a connection state after reconnection, and a relationship between the slot depth and the leakage magnetic flux of the multi-turn turtle shell winding manufactured in the embodiment.
  • FIG. 8 is a diagram showing a configuration of a rotating electrical machine using a stator according to a basic form.
  • FIG. 9 is a diagram illustrating a configuration of a stator of a rotating electrical machine according to a basic form.
  • FIG. 10 is a diagram showing the number of strands of multiple winding turtle shell windings inserted per slot according to the basic configuration.
  • FIG. 11 is a schematic view of a multi-turn turtle shell winding of a 48-slot 4-pole machine manufactured according to the basic configuration.
  • FIG. 12 is a schematic view showing a state in which a multi-turn turtle shell winding of a 48-slot 4-pole machine manufactured according to the basic form is inserted into a stator core.
  • FIG. 13 is an equivalent circuit diagram of a 48-slot 4-pole machine manufactured according to the basic configuration.
  • the stator 30 is used in a rotating electrical machine 50 in which the rotor 40 rotates with respect to the stator 30.
  • the rotating electrical machine 50 is, for example, a three-phase induction motor as shown in FIG.
  • FIG. 8 is a diagram showing a configuration of a rotating electrical machine 50 using the stator 30 according to the basic form.
  • the rotating electrical machine 50 includes a frame 1, a stator 30, a bracket 5, a rotor 40, an outer fan fan 8, and an outer fan cover 9.
  • the stator 30 has a stator core 2 and a stator winding 4.
  • the rotor 40 includes a rotor core 3, an end ring fan 10, a bearing 6, and a shaft 7.
  • the frame 1 has, for example, a substantially cylindrical shape, and houses the stator 30, the bracket 5, the rotor 40, the outer fan fan 8, and the outer fan cover 9.
  • the frame 1 is provided with cooling fins on the surface thereof.
  • the stator 30 is fixed to the frame 1.
  • the stator 30 is configured to accommodate the rotor 40 while being separated from the rotor 40.
  • the stator winding 4 is inserted into the stator core 2.
  • the stator core 2 is configured to be concentric with the shaft 7 and has, for example, a substantially cylindrical shape having an axis along the shaft 7.
  • the stator core 2 is formed of, for example, laminated electromagnetic steel plates.
  • the bracket 5 is configured to form an end plate of the frame 1.
  • the bracket 5 is penetrated by the shaft 7 of the rotor 40.
  • the rotor 40 is configured to be rotatable with respect to the stator 30.
  • the rotor core 3 is attached to the shaft 7.
  • the rotor core 3 is configured in a cage shape, for example, and has two end ring portions and a plurality of conductor bars (a plurality of rotor bars).
  • the end ring fan 10 is attached to two end ring portions and is configured to be rotatable together with the rotor core 3.
  • the bearing 6 is a rolling bearing that rotatably supports the shaft 7 with respect to the bracket 5.
  • the shaft 7 is connected to a rotational load, and transmits rotational power around the rotational axis RA to the rotational load.
  • the shaft 7 is connected to the outer fan fan 8 and transmits the rotational power around the rotation axis RA to the outer fan fan 8.
  • the outer fan 8 rotates to suck outside air and guide it to the frame 1 side to cool the surface of the frame 1 and the cooling fins attached to the frame 1.
  • the outer fan cover 9 is provided so as to cover the outer fan fan 8 and protects the outer fan fan 8 from an external impact or the like.
  • FIG. 9 is a diagram showing a configuration of the stator 30 of the rotating electrical machine 50 according to the basic form.
  • the stator 30 has the stator core 2 and the stator winding 4 as described above.
  • the stator core 2 includes a stator core body 21, a plurality of teeth 12, and a plurality of slots 11.
  • the plurality of teeth 12 extend along the radial direction from the stator core body 21 toward the rotation axis RA.
  • the plurality of teeth 12 have root ends connected to the stator core body 21 in a ring shape.
  • Slots 11 are formed between adjacent teeth 12, respectively.
  • FIG. 9 shows slot numbers No. 1 along the stator core body 21. 1-No. Slots 11 are respectively arranged at positions indicated by 48.
  • the configuration related to the U phase will be mainly described, but the same applies to the other phases (V phase, W phase).
  • the stator winding 4 is inserted into a plurality of slots 11 and wound around a plurality of teeth 12.
  • the stator winding 4 includes a plurality of multiple winding turtle shell windings 14 a to 14 d and a crossover group 17.
  • Each of the multiple winding turtle shell windings 14 a to 14 d is inserted into the slot 11.
  • the crossover group 17 connects a plurality of multiple winding turtle shell windings 14a to 14c to each other.
  • the crossover group 17 has a plurality of crossover lines 17a to 17c.
  • the crossover wire 17a connects the multiple winding turtle shell winding 14a and the multiple winding turtle shell winding 14b.
  • the crossover wire 17b connects the multi-turn turtle shell winding 14b and the multi-turn turtle shell winding 14c.
  • the crossover wire 17c connects the multi-turn turtle shell winding 14c and the multi-turn turtle shell winding 14d.
  • each multi-turn turtle shell winding 14 is composed of a plurality of strands 13 as shown in FIG.
  • the stator winding 4 is configured such that a plurality of multiple winding turtle shell windings 14 a to 14 d are connected by a crossover group 17. Then, the stator winding 4 is inserted into the plurality of slots 11 as shown in FIG. Thereby, the stator 30 of the rotary electric machine 50 shown in FIG. 9 is obtained.
  • FIG. 10 is a diagram showing the number of strands of the multi-turned turtle shell winding 14 inserted per slot according to the basic configuration. For example, FIG. 10 illustrates a case where the number of strands of the multi-turn turtle shell winding 14 inserted per slot is four.
  • FIG. 11 is a schematic diagram of the multi-turn turtle shell windings 14a to 14d of the 48 slot quadrupole machine in the stator 30 of the rotating electrical machine (for example, three-phase induction motor) 50 manufactured according to the basic form.
  • FIG. 12 shows that the multi-turn turtle shell windings 14a to 14d of the 48 slot quadrupole machine in the stator 30 of the rotating electrical machine (for example, three-phase induction motor) 50 manufactured according to the basic form are inserted into the stator core 2. It is the schematic which shows the state.
  • FIG. 12 shows that the multi-turn turtle shell windings 14a to 14d of the 48 slot quadrupole machine in the stator 30 of the rotating electrical machine (for example, three-phase induction motor) 50 manufactured according to the basic form are inserted into the stator core 2. It is the schematic which shows the state.
  • FIGS. 11 and 12 indicate the direction in which the winding is wound.
  • the numbers shown in FIGS. 12 and 9 are the slots 11 numbered in the clockwise order. This number is common to both FIG. 12 and FIG.
  • slot 11 is inserted into the slot 11 as shown in FIG.
  • slot number No. 1 slot 11 and slot number no. 12 slot 11 is inserted with the same multi-turn turtle shell winding 14a. 2 slot 11 and slot number no.
  • a multi-turn turtle shell winding 14 b is inserted into the 11 slots 11.
  • the slot number No. 24 slot 11 and slot number no. 13 slot 11 is inserted with the same multi-turn turtle shell winding 14c. 23 slot 11 and slot number no.
  • a multi-turn turtle shell winding 14 d is inserted into the 14 slots 11.
  • FIG. 13 is an equivalent circuit diagram of a 48-slot 4-pole machine in the stator 30 of a rotating electrical machine (for example, a three-phase induction motor) 50 manufactured according to the basic form.
  • FIG. 13 a configuration corresponding to a plurality of multiple winding turtle shell windings 14a to 14d and a plurality of crossover wires 17a to 17c is shown as a U-phase multiple winding turtle shell winding 14 for convenience.
  • One end of the U-phase multiple winding turtle shell winding 14 is connected to the power supply terminal 15, and the other end is connected to the neutral point terminal 16 (see FIGS. 11, 12, and 9).
  • the present embodiment aims to reduce the burden of preparation for performing crossover dislocation by making the following measures. Below, it demonstrates centering on a different part from a basic form.
  • FIG. 1 is a diagram illustrating a configuration of a stator 30i of a rotating electrical machine 50 according to an embodiment.
  • the crossover wires 19a to 19g are partially cut after the plurality of multiple winding turtle shell windings 18a to 18h are inserted into the plurality of slots 11, and the crossover wires 20a to 20e are different from those before cutting.
  • Crossover dislocation is performed by reconnecting with a pattern.
  • a plurality of multi-turn turtle shell windings 18a to 18h are inserted into the plurality of slots 11 in a state of being connected by the first crossover group 19 (see FIG. 1).
  • the second jumper wire group 20 includes the first jumper wire group 19 after the first jumper wire group 19 is partially cut in a state where the plurality of multi-turn turtle shell windings 18a to 18h are inserted into the plurality of slots 11.
  • a plurality of multi-turn turtle shell windings 18a to 18h are reconnected in a pattern different from that of the line group 19.
  • the first connecting wire group 19 has a plurality of connecting wires 19a to 19g (see FIG. 3).
  • the second connecting wire group 20 has a plurality of connecting wires 20a to 20e (see FIG. 4).
  • each multiple winding turtle shell winding 18 is composed of a plurality of strands 13 as shown in FIG.
  • the stator winding 4 i is configured such that a plurality of multiple winding turtle shell windings 18 a to 18 h are connected by a first crossover group 19. Then, the stator winding 4i is inserted into the plurality of slots 11, and the first crossover group 19 is partially cut as shown in FIG. A plurality of multiple turtle shell windings 18a to 18h are reconnected in a pattern different from that of the crossover wire group 19. At this time, the second crossover group 20 reconnects the multiple turtle shell windings 18a to 18h so that the two multiple turtle shell windings inserted in the same slot 11 are connected in parallel. Let Thereby, the stator 30i of the rotary electric machine 50 shown to FIG. 5, FIG. 1 is obtained.
  • FIG. 2 is a diagram showing the number of strands of the multi-turn turtle shell winding 18 inserted per slot according to the embodiment.
  • FIG. 2 illustrates a case where the number of strands of the multi-turn turtle shell winding 18 inserted per slot is eight.
  • the number of multiple-turned turtle shell windings 18 inserted per slot is doubled, for example. Therefore, the number of strands of the multi-turn turtle shell winding 18 inserted per slot can be doubled.
  • the multi-turn turtle shell winding produced by combining a plurality of strands 13 is equivalent to the multi-turn turtle shell winding having twice the number of strands without changing the existing winding equipment.
  • a stator core with the following electrical characteristics can be manufactured.
  • FIG. 3 is a schematic view of the multi-turn turtle shell windings 18a to 18h of the 48 slot quadrupole machine in the stator 30i of the rotating electrical machine (for example, three-phase induction motor) 50 manufactured according to the embodiment.
  • FIG. 4 shows that the multi-turn turtle shell windings 18a to 18h of the 48 slot quadrupole machine in the stator 30i of the rotating electrical machine (for example, three-phase induction motor) 50 manufactured according to the basic form are inserted into the stator core 2. It is the schematic which shows a mode that it disconnects and reconnects as it is.
  • FIG. 4 shows that the multi-turn turtle shell windings 18a to 18h of the 48 slot quadrupole machine in the stator 30i of the rotating electrical machine (for example, three-phase induction motor) 50 manufactured according to the basic form are inserted into the stator core 2. It is the schematic which shows a mode that it disconnects and reconnects as it is.
  • FIG. 5 is a schematic diagram of the multi-turn turtle shell windings 18a to 18h of the 48 slot quadrupole machine in the stator 30i of the rotating electrical machine (for example, three-phase induction motor) 50 after being disconnected and reconnected.
  • FIG. 1 shows that the multi-turn turtle shell windings 18a to 18h of the 48 slot quadrupole machine in the stator 30i of the rotating electrical machine (for example, three-phase induction motor) 50 are inserted into the stator core 2 after being disconnected and reconnected.
  • the state is shown from the direction along the rotation axis RA.
  • crossover wires 19a, 19c, 19e, and 19g connecting the multi-turn turtle shell windings 18a to 18h are longer than usual because they are disconnected and reconnected after being inserted into the slot 11.
  • the multiple winding turtle shell windings 18a to 18h inserted in the slot 11 cut the crossover wires 19a, 19c, 19e, and 19g as shown in FIG.
  • the cut multiple winding tortoiseshell windings 18a to 18h are reconnected by the crossover wires 20a to 20e so that the two multiple winding tortoiseshell windings inserted in the same slot 11 are connected in parallel.
  • FIG. 6 is an equivalent circuit diagram of a 48-slot 4-pole machine in the stator 30i of the rotating electrical machine (for example, a three-phase induction motor) 50 manufactured according to the embodiment.
  • FIG. 6 a configuration corresponding to a plurality of multi-turn turtle shell windings 18a to 18h and a plurality of crossover wires 19b, 19d, 19f, and 20a to 20e is referred to as two U-phase multi-turn turtle shell windings 18 for convenience.
  • two U-phase multi-turn turtle shell windings 18 are connected in parallel between the feeding terminal 15 and the neutral point terminal 16. Thereby, the number of strands of the multi-turn turtle shell winding inserted per slot can be increased, and the equivalent cross-sectional area of the multi-turn turtle shell winding can be increased. Can be made highly efficient.
  • the multi-turned turtle-shaped windings inserted on the slot opening side and the back side of the slot are crossed between adjacent multi-turned turtle-shaped windings 18a to 18h to form a multi-turned turtle-shaped winding.
  • the purpose is to equalize the leakage flux of the flowing coil, and hence the leakage reactance.
  • FIG. 7B is a diagram showing the relationship between the slot depth and the leakage magnetic flux.
  • connection method between the coils according to the present invention does not limit the connection method unless a problem such as heat generation occurs in the connection part. (Caulking connection or welding connection may be used.)
  • the multi-turn turtle shell composed of double strands without changing the existing winding equipment by a simple cutting / reconnecting operation after inserting the slot 11 into the connecting wire between the multiple winding turtle shell-shaped windings.
  • a stator core having the same electrical characteristics as a form winding can be manufactured.
  • the stator winding 4 i has the crossover wire after the plurality of multi-turn turtle shell windings 18 a to 18 h are inserted into the plurality of slots 11.
  • the transition lines 19b, 19d, 19f, and 20a to 20e are transposed by partially cutting 19a to 19g and reconnecting the transition lines 20a to 20e in a pattern different from that before cutting.
  • the stator winding 4 i includes a plurality of multi-turn turtle shell windings 18 a to 18 h and a second jumper wire group 20.
  • the plurality of multiple winding turtle shell windings 18 a to 18 h are inserted into the plurality of slots 11 while being connected by the first crossover group 19.
  • the second jumper wire group 20 includes the first jumper wire group 19 after the first jumper wire group 19 is partially cut in a state where the plurality of multi-turn turtle shell windings 18a to 18h are inserted into the plurality of slots 11.
  • a plurality of multi-turn turtle shell windings 18a to 18h are reconnected in a pattern different from that of the line group 19.
  • the crossover wires 19a to 19g are partially cut after the plurality of multiple winding turtle shell windings 18a to 18h are inserted into the plurality of slots 11, and the crossover wires 20a to 20e are reconnected in a different pattern from that before cutting.
  • the stator winding 4i can be configured.
  • the second jumper wire group 20 is connected in parallel so that the two multi-turn turtle shell windings inserted in the same slot 11 are connected.
  • the plurality of multiple winding turtle shell windings 18a to 18h are reconnected.
  • two multi-turn turtle shell windings 18 arranged on one of the slot opening side and the slot back side in one slot 11 are arranged on the other of the slot opening side and the slot back side in another slot 11, respectively.
  • the leakage magnetic fluxes of the two multi-turn turtle shell windings 18 can be made equal to each other.
  • stator of the rotating electrical machine according to the present invention is useful for the rotating electrical machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Windings For Motors And Generators (AREA)
PCT/JP2013/063795 2013-05-17 2013-05-17 回転電機の固定子 WO2014184951A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201380076646.1A CN105229900A (zh) 2013-05-17 2013-05-17 旋转电机的定子
PCT/JP2013/063795 WO2014184951A1 (ja) 2013-05-17 2013-05-17 回転電機の固定子
JP2015516859A JP5855318B2 (ja) 2013-05-17 2013-05-17 固定子の製造方法

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Application Number Priority Date Filing Date Title
PCT/JP2013/063795 WO2014184951A1 (ja) 2013-05-17 2013-05-17 回転電機の固定子

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017056296A1 (ja) * 2015-10-01 2017-04-06 三菱電機株式会社 三相誘導電動機
WO2019130893A1 (ja) * 2017-12-25 2019-07-04 株式会社 明電舎 回転機の固定子
EP3982517A1 (de) * 2020-10-12 2022-04-13 Valeo Siemens eAutomotive Germany GmbH Stator für eine elektrische maschine mit verbessertem schutz gegen potentialdifferenzen zwischen benachbarten statorspulen

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DE102019132682A1 (de) * 2019-08-08 2021-02-11 stoba e-Systems GmbH Elektromotor und Stator mit mehrfachbelegten Nuten

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JPH0759283A (ja) * 1993-08-18 1995-03-03 Yaskawa Electric Corp ３相交流モータの電機子巻線結線方法
JP2005224052A (ja) * 2004-02-06 2005-08-18 Fujitsu General Ltd 電動機およびその製造方法
JP2009195004A (ja) * 2008-02-14 2009-08-27 Hitachi Ltd 回転電機
JP2009303420A (ja) * 2008-06-16 2009-12-24 Asmo Co Ltd ステータ、モータ及びステータの製造方法
JP2010074889A (ja) * 2008-09-16 2010-04-02 Asmo Co Ltd ステータ及びステータの製造方法
JP2012095462A (ja) * 2010-10-27 2012-05-17 Hitachi Automotive Systems Ltd 回転電機

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JPH0759283A (ja) * 1993-08-18 1995-03-03 Yaskawa Electric Corp ３相交流モータの電機子巻線結線方法
JP2005224052A (ja) * 2004-02-06 2005-08-18 Fujitsu General Ltd 電動機およびその製造方法
JP2009195004A (ja) * 2008-02-14 2009-08-27 Hitachi Ltd 回転電機
JP2009303420A (ja) * 2008-06-16 2009-12-24 Asmo Co Ltd ステータ、モータ及びステータの製造方法
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Publication number Priority date Publication date Assignee Title
WO2017056296A1 (ja) * 2015-10-01 2017-04-06 三菱電機株式会社 三相誘導電動機
JPWO2017056296A1 (ja) * 2015-10-01 2018-02-08 三菱電機株式会社 三相誘導電動機
US20180358874A1 (en) * 2015-10-01 2018-12-13 Mitsubishi Electric Corporation Three-phase induction motor
US11101723B2 (en) 2015-10-01 2021-08-24 Mitsubishi Electric Corporation Three-phase induction motor
WO2019130893A1 (ja) * 2017-12-25 2019-07-04 株式会社 明電舎 回転機の固定子
JP2019115180A (ja) * 2017-12-25 2019-07-11 株式会社明電舎 回転機の固定子
EP3731378A4 (en) * 2017-12-25 2021-01-20 Meidensha Corporation STATOR OF A ROTATING MACHINE
US11056944B2 (en) 2017-12-25 2021-07-06 Meidensha Corporation Stator of rotary machine
EP3982517A1 (de) * 2020-10-12 2022-04-13 Valeo Siemens eAutomotive Germany GmbH Stator für eine elektrische maschine mit verbessertem schutz gegen potentialdifferenzen zwischen benachbarten statorspulen

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JPWO2014184951A1 (ja) 2017-02-23
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